Improvement in balanced slide-valves



` JOHN C!'1R|S.T1NSEN. Improvement in Bllace Slide Valves.

Patented Jan. 2, 1872.

JOHN cnnrsrmnsnn, or rnArrsMoUTH, NEnnAsKA.

IMPROVEMENT IN BALANQED SLIDE-VALVES.

bearings, so asl to render the motion of the valves are secured together by conical screw- 4certain limits.

Specificationforming part of Letters Patent N o. 122,438, dated January 2, 1872.

To all whom it may concern:

Beit known that I, JOHN GHRIsTIANsEN, of Plattsmouth, in the county of Cass and State of Nebraska, have invented a new and Improved Balance Slide-Valve, and I do hereby declare the following to be a full, clear, and eXact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specicatiomin which drawing- Figure l represents a longitudinal vertical section of this invention. Fig. 2 is a transverse vertical section of the same in the plane a a of Fig. 1. Fig. 3 is a detached plan of one of the split rings. Figs. 4 and 5 are modifications of my invention.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of a series of disk-springs in combination with the slide-valve of a steam-engine, which is con-l nected to said spring or springs with or without an intermediate lever in such a manner that when steam is admitted to the valve-l chest the disk-sprin gs are compressed, and by this compression the pressure ofthe steam on the back ofthe valve is counteracted, and consequently the valve is balanced. The connections between the balance-rod and the steamchest at one and the slide-valve at the opposite end of said rod are formed by knife-edge valve as unobstructed as possible. The diskplugs, split-rin gs, and thimbles, whereby a simple and durable connection is produced and the steam is effectually prevented from entering into the hollowT disk-springs. v

In the drawing, the letter A designates the steam-chest of a steam-cylinder, and in this steam-chest works the slide-valve B in the usual manner, said valve being connected to its rod C, so that it can rise and fall within In the back of the valve are secured two knife-edged bearings, a a, which catch in the eyes oi' a yoke, b, and this yoke connects, by a series of hollow disk-sprin gs, D, with a rod, E, that is suspended from a knifeedge bearin g, a', secured `in the top of the steam-chest, as shown in the drawing: The disk-springs are made of sheet-copper or other sheet metal, each of two parts, which arebound together at their edges, and strengthened by .rings d of metal wire. The inner edges ofthe disk-springs are turned up in opposite directions to form ilanges e, and the outside iianges of the end springs are clamped between rings f and thimbles g, said rings be-` ing provided with internal screw-threads, so that they can be fastened, one to the rod E and the other to a link, F, which forms the connection between the lower spring and the yoke b. After the thimbles have been slipped over the flanges and rings the edges of said flanges are spread on the outside so as to make a tight joint. (See Fig. 1.) The inner iianges of theend springs, and also the flanges of the intermediate spring or springs, are clamped between split-rings g* and thimbles ft, said split;rings being provided with internal screwthreads to receive tapering screw-plugs h, formed so that, by inserting said screw-plugs in the split-rings, these rings are spread, and

the langcs of the springs are iirmly clamped between them and the thimbles. By these ,means the disk-springs are firmly connected together, and no steam is permitted to get into. them, while at the same time said springs are free to expand and contract.

If steam is admitted to the steam-chest the pressure thereof has a 'tendency to compress the disk springs, and consequently to raise the slide-valve from its seat; and by adjusting the area oi' the springs in relation to the area of the back ofthe valve, which is exposed to the pressure of the steam, said valve can be so balanced that it will work perfectly free on its seat entirely independent of the pressure of the steam acting thereon.

, If desired, the springs D may be pla-ced. in

va separate compartment, as shown in Fig. 4;

and in this case they will be connected to rod E by an intermediate lever, E.

The disk-springs may be constructed of a simple diaphragm, Dit, (see Fig. 5,) which is stretched across the open end of a cup-shaped casting, D.

Vhat I claim as new, and desire to secure by Letters Patent, is

1. The arrangement ofthe detached disksprings D D D in combination with the slidevalve of a steam-engine, which is connected with said disk-springs by a rod, with or Withsubstantially in the manner shown and de out an intermediate lever, constructed and opscribed.

@rating substantially in the manner shown and f J N O. GHRI'STIANSEN. described.

2. The. conical plugs h, split-rings gi, and Witnesses: thimbles f, in combination With the anges WILLIAM C. BROWN,

of the disk-springs, constructed and operating THOS. MARSLAND. (152) 

